How to sum a field that is inside a variable

[ecabanas]

Hi,

I would like to sum a field  that is different deppending on t he value of this Varible( that contains the name of the field)

I'm using 

sum($(Categoria_Label))

where Categoria_Label is the variable with the name of the field, but it doesn't work

Any idea what I'm doing wrong?

Thank's

Eduard 

[Mauritz_SA]

Hi Eduard

What is the value of your variable at the moment? Also, what does the expression analyser say at the bottom of your expression builder?

Maybe try:

 Sum('$(Categoria_Label)')

Or

Sum("$(Categoria_Label)")

 Regards,

Mauritz